Výsledky vyhledávání - "Hagen W. Klemm"

A Silica Bilayer Supported on Ru(0001): Following the Crystalline‐to Vitreous Transformation in Real Time with Spectro‐microscopy

Autor: Hans-Joachim Freund, Feng Xiong, Markus Heyde, Dietrich Menzel, Mauricio J. Prieto, Thomas Schmidt, Marek Sierka, Ghada Belhadj Hassine, Hagen W. Klemm

Publikováno v: Angewandte Chemie International Edition
Angewandte Chemie
Angewandte Chemie (International Ed. in English)

The crystalline‐to‐vitreous phase transformation of a SiO2 bilayer supported on Ru(0001) was studied by time‐dependent LEED, local XPS, and DFT calculations. The silica bilayer system has parallels to 3D silica glass and can be used to understa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72178b4319460de919a75bc4490267ac
https://doi.org/10.1002/ange.202002514

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Formation and Evolution of Ultrathin Silica Polymorphs on Ru(0001) Studied with Combined in Situ, Real-Time Methods

Autor: Alexander Fuhrich, Dietrich Menzel, Mauricio J. Prieto, Feng Xiong, Gina Peschel, Ewa Madej, Hagen W. Klemm, Thomas Schmidt, Hans-Joachim Freund

Publikováno v: The Journal of Physical Chemistry C. 123:8228-8243

Silica mono- and bilayer films on Ru(0001) can be physisorbed or chemisorbed, with ordered or vitreous structures, depending on the particular preparation procedures applied. Using the SMART spectro-microscope at BESSY-II with its capabilities for μ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::30855b61226b03c37cb756be0914d3ea
https://doi.org/10.1021/acs.jpcc.8b08525

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Mechanism and Kinetics of Hematite Crystallization in Air: Linking Bulk and Surface Models via Mesoporous Films with Defined Nanostructure

Autor: Roman Schmack, Ralph Kraehnert, Katrin Schulz, Hagen W. Klemm, Thomas Schmidt, Franziska Emmerling, Anke Kabelitz

Publikováno v: Chemistry of Materials. 29:1724-1734

Iron can form numerous oxides, hydroxides, and oxide−hydroxides. Despite their relevance, many of the transformation processes between these phases are still poorly understood. In particular the crystallization of quasi-amorphous hydroxides and oxi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6d0e1518327235e4621b22e9ee315cbe
https://doi.org/10.1021/acs.chemmater.6b05185

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Preparation of silica films on Ru(0001): A LEEM/PEEM study

Autor: Hagen W. Klemm, Hans-Joachim Freund, Thomas Schmidt, Alexander Fuhrich, Martin Timm, Dietrich Menzel, Gina Peschel, Ewa Madej

Publikováno v: Surface Science

We use an aberration corrected spectro-microscope, the low energy electron microscope/photoelectron emission microscope (LEEM/PEEM) SMART, to follow the preparation and structure of a bilayer silica film on Ru(0001) as a function of temperature and o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d34089c2b959fd1c3d0ebdd75eda2f3
https://doi.org/10.1016/j.susc.2015.05.017

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Spatially Resolved Insight into the Chemical and Electronic Structure of Solution-Processed Perovskites-Why to (Not) Worry about Pinholes

Autor: Hagen W. Klemm, Gina Peschel, Dan Wargulski, Ewa Madej, Simone Raoux, Xiaxia Liao, Alexander Fuhrich, Claudia Hartmann, Regan G. Wilks, Golnaz Sadoughi, Henry J. Snaith, Marcus Bär, Thomas Schmidt, Daniel Abou-Ras, Evelyn Handick, Roberto Félix

Publikováno v: Advanced Materials Interfaces

The unprecedented speed at which the performance of solar cells based on solution-processed perovskite thin films has increased, in some ways, appears to violate conventional understanding of device optimization. The relatively poor coverage of the T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae14a7e3806115ccd3c3556d49438e4c
https://hdl.handle.net/21.11116/0000-0000-374D-D21.11116/0000-0001-856A-221.11116/0000-0001-856B-1

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Water Formation under Silica Thin Films: Real-Time Observation of a Chemical Reaction in a Physically Confined Space

Autor: Hans-Joachim Freund, Dietrich Menzel, Feng Xiong, Daniel M. Gottlob, Thomas Schmidt, Mauricio J. Prieto, Hagen W. Klemm

Publikováno v: Angewandte Chemie International Edition
Angewandte Chemie (International Ed. in English)

Using low energy electron microscopy and local photoelectron spectroscopy, we investigated the water formation from adsorbed O and H2 on a Ru(0001) surface covered with a vitreous SiO2 bilayer (BL) and compared it to the same reaction on bare Ru(0001

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8e5cd545e1dd0053b1e3cadc56e31ba

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Exceptional Dewetting of Organic Semiconductor Films: The Case of Dinaphthothienothiophene (DNTT) at Dielectric Interfaces

Autor: Gina Peschel, Andrea Karthäuser, Thomas Schmidt, Francesca Genuzio, Tobias Breuer, Alexander Fuhrich, Gregor Witte, Hagen W. Klemm

Publikováno v: ACS applied materialsinterfaces. 9(9)

The novel organic semiconductor dinaphthothienothiophene (DNTT) has gained considerable interest because its large charge carrier mobility and distinct chemical robustness enable the fabrication of organic field effect transistors with remarkable lon

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf7083e9877b83cf0bc01ad75dd44c31
https://pubmed.ncbi.nlm.nih.gov/28218510

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In Situ Patterning of Ultrasharp Dopant Profiles in Silicon

Autor: Michelle Y. Simmons, Thomas Schmidt, Gina Peschel, Hagen W. Klemm, Yuran Niu, Justin W. Wells, Alexei Zakharov, S. P. Cooil, D. Andrew Evans, Jill A. Miwa, Federico Mazzola

Publikováno v: Cooil, S P, Mazzola, F, Klemm, H W, Peschel, G, Niu, Y R, Zakharov, A A, Simmons, M Y, Schmidt, T, Evans, D A, Miwa, J A & Wells, J W 2017, ' In Situ Patterning of Ultrasharp Dopant Profiles in Silicon ', A C S Nano, vol. 11, no. 2, pp. 1683-1688 . https://doi.org/10.1021/acsnano.6b07359

We develop a method for patterning a buried two-dimensional electron gas (2DEG) in silicon using low kinetic energy electron stimulated desorption (LEESD) of a monohydride resist mask. A buried 2DEG forms as a result of placing a dense and narrow pro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e5b420e1eee62f0f0f6f7ca0cf0a49cd
https://pubmed.ncbi.nlm.nih.gov/28182399

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In-Ga precursor islands for Cu(In,Ga)Se ₂ micro-concentrator solar cells

Autor: Hagen W. Klemm, Torta Boeck, Thomas Teubner, Martina Schmid, F. Ringleb, Alexander Fuhrich, Thomas Schmidt, K. Eylers, Berit Heidmann, Thomas Unold, Gina Peschel, Sergiu Levcenco

We present a bottom-up approach for the fabrication of CuIn x Ga (l-x) Se 2 (CIGSe) micro-concentrator solar cells by local growth of In-Ga micro-islands. In addition to the intended islands, the indium deposition leads to a parasitic indium wetting

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7497aa25db002435b70ee7ba1d965ff
https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&origin=inward&scp=85063467004

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Electrochemical Passivation of Homoepitaxial InP (100) Thin Films for Light Induced Hydrogen Evolution: A Synchrotron Radiation Photoelectron Spectroscopy Study

Autor: Hagen W. Klemm, N. Szabó, Christian Heine, Hans-Joachim Lewerenz, A.G. Muñoz, Thomas Hannappel

Publikováno v: ECS Transactions. 35:141-150

Recent synchrotron radiation photoelectron spectroscopy (SRPES) investigations on the surface chemistry of electrochemically conditioned surfaces of homo-epitaxial p-InP(100) layers deposited by MOVPE are described. The electrochemical conditioning,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::459af562215ec7b2998dcc1ee5c26784
https://doi.org/10.1149/1.3567746

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